Thanks for showing me what PINN is, works perfectly. This is off-topic, but do you know if there's a way to uninstall PINN afterwards and use a different bootloader?

I'm attempting to install Arch Linux ARM on my Raspberry Pi 4B using instructions on https://github.com/phortx/Raspberry-Pi-Setup-Guide . I first used an existing Arch Linux instance running on VirtualBox to handle disk partitioning, but there was no video output and the ACT LED was blinking 4 times...